Filter.



No. 716,989. Patented Dec. 30, |902.

V J. A.; DAVIDSON..

FILTER.

(Application Bied Sept. 19, 1902.)

(no Middel.)

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JOHN A. DAVIDSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO NATIONAL FILTERCOMPANY, OF CHICAGO, ILLINOIS.

FILTER.

SPECIFICATION forming part of Letters Patent No. 716,989, dated December30, 1902. Application filed September 19,1902. Serial No. 124,096. (Nomodel.)

To all whom it may concern,.-

Be it known that I, JOHN A. DAVIDSON, a citizen of the United States,residing at Chicago, in the county of Cook and Statewof Illinois, haveinvented a certain new and useful Improvement in Filters, of whichthefollowing is a specification.

The object of this invention is to construct a filter employing afiltering-stone which may be readily cleaned by the rotation of suitablemechanism without the necessity for taking apart the filter and scouringthe stone and at the same time arranging said mechanism so that theabrasive or scouring material shall bear uniformly against the outerface of the stone at all times, thereby insuring a uniform cleansing orscouring of the stone for the purpose of removing the sediment and otherimpurities and deleterious matter collected thereon, which matter may beeasily and readily carried off from the filter-tank after being removedfrom the filtering-stone by iiushing, thereby thoroughly cleansing ythefilter and enabling it to perfectly perform its work.

The invention, moreover, relates. to the cleaning or scouring mechanism,which may be employed with filters of other than the specificconstruction hereinafter described; and it consists in the features ofconstruction and combination of parts hereinafter described and claimed.

In the draWings,`Figure l is an elevation of the filter, showing thetank in section and the filtering-stone and scouring mechanism inelevation; Fig. 2, a side View of the scouring mechanism; Fig. 3, a topview of the same, and Fig. a a cross-sectional view of the frame orcasing containing the abrasive material.

As shown, the filter is constructed with a base or bottom A, supportedon legs A` and provided with an annular` flange A2 and a circumferentialrecess or ledge a in its upper face, having therein a strip of packingmateriala for the purpose of sealing the filter shell or tank whenbrought in contact with the base or bottom. In the center of the base orbottom is formed a chamber B, having on its' inner face screw-threads bfor the attachment thereto of the stone and further provided with anoutlet passage or pipe B, provided at its end with a faucet B2, asusual, for the withdrawal of the filtered Water from the iuterior of thestone. An inlet-pipe C, having a mouth c, leads through the base orbottom into the interior of the filter, and an outletpipe C', enteringthe filter at the point c and provided with a faucet c2, serves towithdraw the Water from the filter-tank without first passing it throughthe stone, which withdrawal is necessary in iushing the filter in ordertocarry od the sediment and other matter which has been collected andscoured from the stone by the action of the cleaning or scouringmechanism.

The tank or shell of the Iilter consists of a cylinder D,provided at itslower rim with an outwardly-turned circumferential iange d, which flangecontacts with the packing carried by the base or bottom and firmly sealsthe shell or casing thereto, and thereby prevents the escape of waterand enables thejoint to withstand .the pressure necessary to force thewater through the stone. The cylinder is locked orfastened to the baseor bottom by means of an annular' 4rim d', provided with anupwardly-turned. collar cl2 for ycontact with the outer face of thecylinder andprovided with a downwardly-turnedcollar or iiange d3,whichencircles the edge of thebase or bottom plate to which the entire rim isattached by means of screw-bolts d4.

As shown,the stoneE is of cylindrical shape and is attached and securelyheld in place by means of a hollow plug E', screw-threaded on itsexterior, to which the stone is secured in any suitable manner, whichplug communicates with the interior of the stone and is 'screw-threadedinto the chamber in the bottomor base of the cylinder, thus establishingcommunication between the interior of the stone and the faucet forwithdrawing the filtered water for use, although other means of securingthe stone may4 be employed. From thetop of the stone extends a pivotalstud c, having at its base abearing-collar e', and said stud extends upinto the recessed boss f of the cross-head F for supporting andpivotally mounting the scouring or cleaning mechanism, which latterprincipally forms the subject-matter of the present invention. Thiscross-head is provided on its upper face IOO with a tapering stud f, tothe upper face of which is tixedly attached a pivotal shaft f2, havingat its free end a squared head f3 for the reception of a handle thereon.The cross-head is provided at its ends with ears G,and between the earsare mounted sleeves g,pivoted to the ears by means of pivot-pins g', andto the sleeves are attached, to rest within theears,downwardly-depending arms G,provided at their tree ends with headsg2 for the passage therethrough ot' pivotal pins g3, which latter extendthrough sleeves g4 on the external faces of trough-shaped frames H forcontaining therein the abrasive material, and the cross-head supportingthe frames is of suitable dimensions to allow the frames to lie inparallel relation to the external face of the stone. Moreover, theframes being pivoted to the depending arms, which are themselves pivotedto the cross-head, the space between the two frames may be variedconsiderably without changing the parallel relation of the frames toeach other. Within the frames are strips H' of abrasive material, suchas corundum or emery, although other substances may be likewiseemployed. The abrasive material is arranged to project beyond the edgesof the frame in which it is contained, so that the scouring-surfaceswill always be presented lto the exterior face of the stone, and,moreover, the pivotal action of the frames enables the abrasive surfaceto pass over inequalities in the stone without interfering with theaction of the abrasive material. In order tohold the abrasive materialcarried by the two frames into irm contact with the stone, springs I,two in number, are provided to bear against the frames carrying theabrasive material, and these springs are constructed with side arms @land a yoke t", and the side arms are turned to form loops or coils i2around the sleeves pivoted to the ears on the cross-head. The. free endsof the arms composing the springs are carried back toward the center ofthe cross-head and are secured against lateral displacement between lugs'i4 on the upper face of the cross-head. This arrangementis one whichprevents the displacement of the springs at any point, since they areadapted to lie within the depending side arms which support the frameand are held in place by the passage therethrough of the pivoted sleevesand are of sufiicient rigidity to exert a strong inward pressure at alltimes on the frames carrying the abrasive material.

The cylinder composing the body of the iilter-casing is closed at itsupper end by means ot' a cap or cover J, provided with adownwardly-turned rim j for attachment to the cylinder composing thebody of the filter-casing. The cap or cover is provided in its centerwith a recess j for the reception therein of a hollow screw-threadedplug J', having a iiange j2, adapted to lie within the recess in thecover, to which it is secured by brazing, soldering, or other suitablemeans. The plug is further secured in place by means of a hollowscrew-threaded nut j, which fits down over the plug and contacts withthe outer face of the recessed portion of the cap or cover, and a handleK, having a head K', adapted to tit down overthe hollow nut, is providedwith a squared hole or recess k, adapted to tit onto the squared headwhich connects with the cross-head supporting the scouring mechanism androtate the entire mechanism, thereby causing the abrasive material toscour the stone and clean the same.

The action of the scouring mechanism will be partially understood fromthe foregoing description, but may be briefly stated as follows: When itis desirable to clear the sediment and other matter from the stone afterthe same has collected thereon, the scouring mechanism is revolved bymeans of the handle, causing the emery, corundum, or other scouringmaterial to pass transversely over the surface of the filtering-stoneheld under a pressure thereon by means of the springs contacting withthe frames carrying the abrasive material. These frames are so pivotedas to adapt themselves under pressure to the inequalities of the stoneand at the same time exert a continuous abrasive action thereon.Moreover, as the stone is worn away bythe continued action of theabrasive material the latter will be forced by the springs acting on theframes into continued contact with the stone, and the pivotalarrangement of the side arms supporting the frames will enable thelatter to maintain their parallel relation irrespective of theirdistance from one another.

What I regard as new, and desire to secure by Letters Patent, is-

1. In combination with a filter employing a stone, strips of abrasivematerial held under pressure into contact with the stone, framessupporting the abrasive material, arms to whichthe frames are pivotallyattached, a head supporting the arms, and means for revolving the headand the arms attached thereto, substantially as described.

2. In combination with a lter employing a stone, strips of abrasivematerial held under pressure in contact with the stone, framessupporting the abrasive material, arms to which the frames are pivotallyattached, a cross -head to which the arms are pivotally attached, andmeans for, rotating the head and the arms attached thereto,substantially as described.

3. In combination with a ilter employing a stone, strips of abrasivematerial held l'under pressure in contact with the stone, framessupporting the abrasive material, arms to which the frames are pivotallyattached, a cross-head to which the arms are pivotally attached, springsexerting an inward pressure on the frames, and means for rotating thehead and the arms attached thereto, substantially as described.

4. In combination with a filter employing a IOO IIO

stone, strips of abrasive material held under pressure in contact withthe stone, troughshaped frames containing the abrasive material,depending arms to which the troughshaped frames are pivotally attached,a crosshead pivotally supported on the stone to which the depending armsare pivotally attached, springs exerting an inward pressure on thetrough-shaped frames, and means for supporting the arms dependingtherefrom, substantially as described.

5. In combination with a filter employing a stone, strips of abrasivematerial held under pressure in Contact with the stone, troughshapedframes inclosing the strips of abrasive materiahdepending arms to theends of which ing upwardly from the cross-head, and means for impartingrotation through the post to the cross-head and the arms dependingtherefrom, substantially as described.

JOHN A. DAVIDSON.

Witnesses:

THOMAS A. BANNING, WALKER BANNING.

